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[Paul Bolger]

> Effective i that there is (more than) enough to keep your attention until
> the next ad break. Contrast just a talking head sans scroller, you might
> actually get bored and change channels instead of re-directing your
> attention to the scroller.

The scroller is there to give the impression that something is
actually happening. If you were to log CNN and time the bits where
they are giving you new information - either on the crawl or from the
presenter - I suspect that it wouldn't amount to more than half an
hour a day.